<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="../js/jquery.min.js"></script>
  <script>
    $(() => {
      $('button').click(function () {
        $(this).css('color', 'red').siblings().css('color', '')
      })
    })
  </script>
</head>

<body>
  <button>快速</button>
  <button>快速</button>
  <button>快速</button>
  <button>快速</button>
  <button>快速</button>
  <button>快速</button>
  <button>快速</button>
</body>

</html>